It’s been 20 years since an international agreement was reached to address the hole in the ozone layer. “The discovery shocked people, said James R. Fleming, a science and technology historian at Colby College in Maine … He uses a cartoon from the 1980s in his classes. The first frame shows a recognizable character, renamed Little Ozone Annie, singing: ‘The sun will come out tomorrow.’ The next frame shows her cooked into a pile of ashes.”